# E and M?

A stream of electrons with velocity $$3\times 10^{7}\text{ m/s}$$ is displaced by $$2\text{ mm}$$ after travelling $$0.1\text{ m}$$ in an electric field of strength $$1800\text{ V/m}$$. Find accurate e/m from these values. If your answer is $$x\times 10^{11}$$, find $$x$$.

Suppose there are $$n$$ electrons with mass $$m$$ and charge $$e$$.

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